CN105334605A - Zooming lens and image acquisition equipment - Google Patents
Zooming lens and image acquisition equipment Download PDFInfo
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- CN105334605A CN105334605A CN201410403612.5A CN201410403612A CN105334605A CN 105334605 A CN105334605 A CN 105334605A CN 201410403612 A CN201410403612 A CN 201410403612A CN 105334605 A CN105334605 A CN 105334605A
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Abstract
The invention discloses a zooming lens and image acquisition equipment, belongs to the imaging technology field and aims to improve depth of field of the zooming lens. The zooming lens comprises a zooming set and a focusing set which are sequentially arranged from an object side to an image side, wherein the zooming set comprises a first flat concave lens having negative focal power, a first pair concave lens having negative focal power and a first pair convex lens having positive focal power which are sequentially arranged from the object side to the image side, the plane of the first flat concave lens faces towards the object side, the focusing set comprises a second pair convex lens having positive focal power, a first meniscus lens having negative focal power, a third pair convex lens having positive focal power, a second pair concave lens having negative focal power, a fourth pair convex lens having positive focal power and a second meniscus lens having negative focal power which are sequentially arranged from the object side to the image side, and a concave face of the first meniscus lens and a concave face of the second respectively face the object side.
Description
Technical field
The present invention relates to technical field of imaging, particularly relate to a kind of zoom lens and image capture device.
Background technology
Zoom lens refers to can convert focal length within the specific limits, thus obtains the camera lens of different size image and different scenery scope.Because it can change coverage when not changing shooting distance by changing focal length, and the quantity of carrying apparatus for making a video recording can be reduced and be widely used.
Existing common zoom lens when taking, object scene is focused on clear after, the close shot in object scene front or the distant view at rear normally fuzzy, especially in focal length part.The main cause of this phenomenon is caused to be: the planform of existing zoom lens, the parameters such as abbe number are mated bad with image-forming condition, zoom lens can only be ensured, and object scene and close shot are simultaneously clear, or object scene and distant view are simultaneously clear, namely existing zoom lens cannot obtain the enough large depth of field, thus is difficult to ensure that object scene, close shot and distant view three are simultaneously clear.Concrete, ordinary zoom lens in the design only for a certain individually defined thing apart from being optimized and aberration correction, other scenery (i.e. distant view and close shot) being positioned at spatial dimension before and after object scene then have out of focus phenomenon in various degree; Because depth of field size and focal length square are inversely proportional to, so can show more obvious at telescope end; Like this, the scope of the ordinary zoom lens depth of field will inevitably be caused less.
To sum up, existing zoom lens cannot obtain the enough large depth of field.
Summary of the invention
Embodiments provide a kind of zoom lens and image capture device, in order to improve the depth of field of zoom lens.
A kind of zoom lens that the embodiment of the present invention provides, comprises the zoom group and focus groups that set gradually from the object side to image side, wherein,
Described zoom group comprises that the focal power set gradually from the object side to image side is negative the first plano-concave lens, focal power be the first negative biconcave lens and focal power is the first positive biconvex lens, and wherein, the plane of described first plano-concave lens is towards thing side;
Described focus groups comprises that the focal power set gradually from the object side to image side is positive the second biconvex lens, focal power is negative the first meniscus lens, focal power is positive the 3rd biconvex lens, focal power is negative the second biconcave lens, focal power be the 4th positive biconvex lens and focal power is the second negative meniscus lens, wherein, the concave surface of described first meniscus lens and the concave surface of described second meniscus lens are all towards thing side.
The zoom lens that the embodiment of the present invention provides, adopt the lens of nine ad hoc structure shapes, and be arranged in order to image side according to from thing side, and by the distribution of the focal power of each optical lens, make the planform of zoom lens, the parameters such as abbe number are mated with image-forming condition, can obtain the image of object scene, close shot and distant view clearly, namely can reach the object expanding the zoom lens depth of field.
Preferably, described first biconcave lens and described first biconvex lens glue together, and described second biconvex lens and described first meniscus lens glue together, and described 3rd biconvex lens and the second biconcave lens glue together.At this, connected by the mode of gummed, effectively can reduce aberration.
Preferably, described focus groups also comprises: be arranged at described second biconvex lens towards the aperture diaphragm on the surface of thing side.
Preferably, described focus groups also comprises:
Be arranged at the first packing ring between the first meniscus lens and the 3rd biconvex lens, described first packing ring is for fixing the relative position between the first meniscus lens and the 3rd biconvex lens;
Be arranged at the second packing ring between the second biconcave lens and the 4th biconvex lens, described second packing ring is for fixing the relative position between the second biconcave lens and the 4th biconvex lens.
Preferably, the Abbe number of described second biconcave lens is greater than 55, and refractive index is greater than 1.58; The Abbe number of the 4th biconvex lens is greater than 60, and refractive index is greater than 1.6.
Preferably,
Meet between focal distance f ' 2 of the focal distance f of zoom group ' 1 and focus groups: f ' 1>f ' 2;
Zoom lens is in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets between W:
2.5<f’T/f’W<3.2；
The focal distance f of zoom group ' 1 and zoom lens are in the focal distance f of wide-angle side ' meet between W:
2.15<f’1/f’W<2.35；
The displacement dd1 of zoom group when zoom lens is from wide-angle side to telescope end zoom, zoom lens are in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets W:
0.5<dd1/(f’T-f’W)<0.7；
The refractive index of the first meniscus lens is greater than 1.8;
When zoom lens is positioned at wide-angle side from the first plano-concave lens towards the summit of thing side to image planes in the distance LW of optical axis direction and the zoom lens focal distance f in wide-angle side ' meet W:
5.5<LW/f’W<5.8；
Rear cut-off distance fbw when zoom lens is positioned at wide-angle side and zoom lens are in the focal distance f of wide-angle side ' meet between W:
0.8<fbw/f’W<1.1。
Preferably, in described zoom group, the span at the center of described first plano-concave lens and the interval in the direction of the optical axis, center of described first biconcave lens is [1mm, 1.5mm];
In described focus groups, the span at the center of described first meniscus lens and the interval in the direction of the optical axis, center of described 3rd biconvex lens is [0.1mm, 0.3mm]; The span at the center of described second biconcave lens and the interval in the direction of the optical axis, center of the 4th biconvex lens is [1.05mm, 2.05mm]; The span at the center of described 4th biconvex lens and the interval in the direction of the optical axis, center of described second meniscus lens is [0.1mm, 0.64mm].
Preferably, in described zoom group, the center of described first plano-concave lens and the center of described first biconcave lens in the direction of the optical axis be spaced apart 1.25mm;
In described focus groups, the center of described first meniscus lens and the center of described 3rd biconvex lens in the direction of the optical axis be spaced apart 0.1mm, the center of described second biconcave lens and the center of the 4th biconvex lens in the direction of the optical axis be spaced apart 1.55mm, the center of described 4th biconvex lens and the center of described second meniscus lens in the direction of the optical axis be spaced apart 0.34mm.
Preferably, described zoom lens also comprises motor driver, zoom gear group and linkage, and wherein, described zoom group and described focus groups are arranged in described linkage,
Described motor driver is connected with described zoom gear group, drives described zoom gear group to rotate;
Described zoom gear group drags the motion of described linkage when rotating, the motion of described linkage drives the described zoom group of described linkage inside and described focus groups synchronizing moving.
A kind of image capture device that the embodiment of the present invention provides, comprises above-mentioned zoom lens.The image capture device that the embodiment of the present invention provides can be digital camera or Digital Video.
Accompanying drawing explanation
A kind of zoom lens that Fig. 1 provides for the embodiment of the present invention is at the structural representation of wide-angle side;
Fig. 2 is that the zoom lens of the embodiment of the present invention one is at the curve map of wide-angle side focusing from optical transfer function during 10m;
Fig. 3 is the curve map of the optical transfer function of zoom lens when wide-angle side minimum photographic distance 5m of the embodiment of the present invention one;
Fig. 4 is the curve map of the optical transfer function of zoom lens when wide-angle side dolly-out,s dolly-back distance infinite distance of the embodiment of the present invention one;
The zoom lens that Fig. 5 (a) is the embodiment of the present invention one is at curvature of field figure corresponding to wide-angle side;
The zoom lens that Fig. 5 (b) is the embodiment of the present invention one is at distortion figure corresponding to wide-angle side;
Fig. 6 is that the zoom lens of the embodiment of the present invention one is at chromaticity difference diagram corresponding to wide-angle side;
Fig. 7 be the zoom lens of the embodiment of the present invention one in telescope end focusing from the curve map for optical transfer function during 20m;
Fig. 8 is the curve map of the optical transfer function of zoom lens when telescope end minimum photographic distance 6m of the embodiment of the present invention one;
Fig. 9 is the curve map of the optical transfer function of zoom lens when telescope end dolly-out,s dolly-back distance infinite distance of the embodiment of the present invention one;
The zoom lens that Figure 10 (a) is the embodiment of the present invention one is at curvature of field figure corresponding to telescope end;
The zoom lens that Figure 10 (b) is the embodiment of the present invention one is at distortion figure corresponding to telescope end;
Figure 11 is that the zoom lens of the embodiment of the present invention one is at chromaticity difference diagram corresponding to telescope end;
The structural representation of a kind of zoom lens that Figure 12 provides for the embodiment of the present invention two;
The cam curve figure that Figure 13 is the zoom lens shown in Figure 12.
Reference numeral:
1-first plano-concave lens, 2-first biconcave lens, 3-first biconvex lens, 4-aperture diaphragm, 5-second biconvex lens, 6-first meniscus lens, 7-the 3rd biconvex lens, 8-second biconcave lens, 9-the 4th biconvex lens, 10-second meniscus lens, 11-first packing ring, 12-second packing ring, 21-motor driver, 22-zoom gear group, 23-linkage.
Embodiment
In order to improve the depth of field of zoom lens, the invention provides a kind of zoom lens, adopt the lens of nine ad hoc structure shapes, and with certain sequential arrangement, and by the distribution of the focal power of each optical lens, the image of object scene, close shot and distant view clearly can be obtained, and then reach the object improving the zoom lens depth of field.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of zoom lens provided for the invention process case is at the structural representation of wide-angle side.This zoom lens comprises: the zoom group set gradually from the object side to image side and focus groups; Wherein, described zoom group comprise the plane that sets gradually from the object side to image side towards thing side and focal power be negative the first plano-concave lens 1, focal power is negative the first biconcave lens 2, focal power is the first positive biconvex lens 3.
Described focus groups comprises that the focal power set gradually from the object side to image side is positive the second biconvex lens 5, focal power is negative the first meniscus lens 6, focal power is positive the 3rd biconvex lens 7, focal power is negative the second biconcave lens 8, focal power be the 4th positive biconvex lens 9 and focal power is the second negative meniscus lens 10.
Preferably, in order to reduce aberration, described first biconcave lens and described first biconvex lens glue together, and described second biconvex lens and described first meniscus lens glue together, and described 3rd biconvex lens and the second biconcave lens glue together.Wherein, bonding technique adopts prior art, does not repeat them here.
Preferably, in order to limit the luminous flux entered from zoom group focus groups, above-mentioned focus groups also comprises: be arranged at the second biconvex lens 5 towards the aperture diaphragm 4 on the surface of thing side.
Preferably, in order to make the position of each lens in focus groups relatively fixing, interval between each lens of strict guarantee, wherein, second biconvex lens 5, first meniscus lens 6, the 3rd biconvex lens 7, second biconcave lens 8, the 4th biconvex lens 9, second meniscus lens 10 because of planform and towards restriction, first packing ring 11 is set between the first meniscus lens 6 and the 3rd biconvex lens 7 and ensures interval, second packing ring 12 is set between the second biconcave lens 8 and the 4th biconvex lens 9 and ensures interval; Wherein, the structure of the first packing ring and the second packing ring needs according to the design of the internal diameter of lens barrel and optical property and determines, and material can adopt prior art, such as, can select aluminum material; In addition, it should be noted that, this second packing ring 12 also plays the effect of vignetting stop: because aperture proper proportion reduces, and has blocked the wide-aperture light of a part of Large visual angle, so it serves the effect of vignetting stop, is conducive to promoting image quality; Such as this second packing ring has blocked the light beyond 0.86 aperture of 0.7 visual field, remains 0.86 with the light of internal orifice dimension, thus makes 0.7 visual field picture element better, and can not completely be kept off.
Preferably, in order to make zoom lens realize day and night, namely infrared band and visible light wave range confocal, the Abbe number of above-mentioned second biconcave lens 8 is greater than 55, and refractive index is greater than 1.58; The Abbe number of the 4th biconvex lens is greater than 60, and refractive index is greater than 1.6.
Preferably, in this zoom lens, each parameter meets the following conditions:
Meet between focal distance f ' 2 of the focal distance f of zoom group ' 1 and focus groups: f ' 1>f ' 2;
Zoom lens is in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets between W:
2.5<f’T/f’W<3.2；
The focal distance f of zoom group ' 1 and zoom lens are in the focal distance f of wide-angle side ' meet between W:
2.15<f’1/f’W<2.35；
The displacement dd1 of zoom group when zoom lens is from wide-angle side to telescope end zoom, zoom lens are in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets W:
0.5<dd1/(f’T-f’W)<0.7；
The refractive index of the first meniscus lens is greater than 1.8;
When zoom lens is positioned at wide-angle side from the first plano-concave lens towards the summit of thing side to image planes in the distance LW of optical axis direction and the zoom lens focal distance f in wide-angle side ' meet W:
5.5<LW/f’W<5.8；
Rear cut-off distance fbw when zoom lens is positioned at wide-angle side and zoom lens are in the focal distance f of wide-angle side ' meet between W:
0.8<fbw/f’W<1.1。
When meeting above condition, ensure that the aberration of whole system is well corrected, zoom ratio reaches request for utilization.
Preferably, in zoom group, the span at the center of the first plano-concave lens 1 and the interval in the direction of the optical axis, center of the first biconcave lens 2 is [1mm, 1.5mm]; In order to make the position of each lens in zoom group relatively fixing, the interval between each lens of strict guarantee, wherein, the edge of the first plano-concave lens 1 directly contacts with the edge of the first biconcave lens 2, namely relatively fixing with the face way of contact; And both the first biconcave lens 2 and the first biconvex lens 3 glue together, save a spacer ring like this;
In focus groups, both second biconvex lens 5 and the first meniscus lens 6 glue together, form two cemented doublet, the span at the center of the first meniscus lens 6 and the interval in the direction of the optical axis, center of the 3rd biconvex lens 7 is [0.1mm, 0.3mm]; 3rd biconvex lens 7 and the second biconcave lens 8 glue together, and form two cemented doublet; The span at the center of the second biconcave lens 8 and the interval in the direction of the optical axis, center of the 4th biconvex lens 9 is [1.05mm, 2.05mm]; The span at the center of the 4th biconvex lens 9 and the interval in the direction of the optical axis, center of the second meniscus lens 10 is [0.1mm, 0.64mm].
In a preferred embodiment, in zoom group, the center of the first plano-concave lens 1 and the center of the first biconcave lens 2 in the direction of the optical axis be spaced apart 1.25mm;
In focus groups, the center of the first meniscus lens 6 and the center of the 3rd biconvex lens 7 in the direction of the optical axis be spaced apart 0.1mm, the center of the second biconcave lens 8 and the center of the 4th biconvex lens 9 in the direction of the optical axis be spaced apart 1.55mm, the center of the 4th biconvex lens 9 and the center of the second meniscus lens 10 in the direction of the optical axis be spaced apart 0.34mm.
In specific implementation process, when the internal diameter value of the lens barrel of this zoom lens is fixed, be such as Φ 10, the parameter of each lens of described zoom lens meets the condition listed by table one:
Table one
Wherein, R1 is the radius-of-curvature of lens towards the face of thing side, and R2 is the radius-of-curvature of lens towards the face of image side, and Tc is lens center thickness, and Nd is the refractive index of lens, and Vd is the Abbe number of lens; Certainly, if some parameter values of one of them lens are fixed, then the value of other each parameter of this zoom lens is all fixing, such as, in a preferred embodiment, when the R2 value of the first plano-concave lens 1 is 29.277, the parameter of each lens in described zoom lens meets the condition listed by following table two:
| Lens sequence number | R1(mm) | R2(mm) | Tc(mm) | Nd | Vd |
| 1 | ∞ | 29.277 | 1.14 | 1.723 | 38.022 |
| 2 | -13.355 | 13.2 | 0.7 | 1.806 | 40.945 |
| 3 | 13.25 | -27.2 | 2.19 | 1.785 | 25.72 |
| 5 | 13.376 | -9.1 | 3.19 | 1.617 | 53.928 |
| 6 | -9.1 | -34.6 | 0.7 | 1.847 | 23.79 |
| 7 | 8.18 | -8.18 | 3.9 | 1.657 | 51.157 |
| 8 | -8.18 | 5.4 | 1.31 | 1.623 | 56.952 |
| 9 | 8.134 | -18.15 | 3.33 | 1.618 | 63.417 |
| 10 | -7.7 | -27.954 | 1.29 | 1.702 | 41.14 |
Table two
Below in conjunction with accompanying drawing and specific embodiment, the present invention will be described.
Embodiment one
In embodiment one, as shown in Figure 1, this zoom lens comprises described zoom lens: the zoom group set gradually from the object side to image side and focus groups; Wherein, described zoom group comprise the plane that sets gradually from the object side to image side towards thing side and focal power be negative the first plano-concave lens 1, focal power is negative the first biconcave lens 2, focal power is the first positive biconvex lens 3; Described focus groups comprises that the focal power set gradually from the object side to image side is positive the second biconvex lens 5, focal power is negative the first meniscus lens 6, focal power is positive the 3rd biconvex lens 7, focal power is negative the second biconcave lens 8, focal power be the 4th positive biconvex lens 9 and focal power is the second negative meniscus lens 10; Wherein, described first biconcave lens 2 glues together with described first biconvex lens 3, and described second biconvex lens 5 glues together with described first meniscus lens 6, and described 3rd biconvex lens 7 and the second biconcave lens 8 glue together;
Be arranged at the second biconvex lens 5 towards the aperture diaphragm 4 on the surface of thing side;
Be arranged on the first packing ring 11 between the first meniscus lens 6 and the 3rd biconvex lens 7;
The second packing ring 12 arranged between the second biconcave lens 8 and the 4th biconvex lens 9 ensures interval.
Wherein, each lens meet the determined condition of table two, and, this zoom lens when wide-angle side meet: in zoom group, the center of the first plano-concave lens 1 and the center of the first biconcave lens 2 in the direction of the optical axis be spaced apart 1.25mm; In focus groups, the center of the first meniscus lens 6 and the center of the 3rd biconvex lens 7 in the direction of the optical axis be spaced apart 0.1mm, the center of the second biconcave lens 8 and the center of the 4th biconvex lens 9 in the direction of the optical axis be spaced apart 1.55mm, the center of the 4th biconvex lens 9 and the center of the second meniscus lens 10 in the direction of the optical axis be spaced apart 0.34mm.
Below in conjunction with optical transfer function (ModulationTransferFunction, the MTF) curve map of this zoom lens, the situation that the zoom lens provided the embodiment of the present invention one realizes the large depth of field is described.Wherein, optical transfer function is used for the image quality of an evaluation optical system, and its curve is higher, more level and smooth, shows that the image quality of system is better.
As shown in Figure 2, Figure 3 and Figure 4, wherein, Fig. 2 is that zoom lens is at the curve map of wide-angle side focusing from optical transfer function during 10m, Fig. 3 is the curve map of the optical transfer function of zoom lens when wide-angle side minimum photographic distance 5m, and Fig. 4 is the curve map of the optical transfer function of zoom lens when wide-angle side dolly-out,s dolly-back distance infinite distance.Known from this three width figure, zoom lens is when wide-angle side is taken close shot (object distance is 5m), object scene (object distance is 10m) and distant view (object distance is infinite distance), the curve map of the MTF that three kinds of scenes are corresponding is basically identical, and, in three kinds of scenes, MTF curve is all smoother and concentrated, that is, this zoom lens can be taken object scene, close shot and distant view simultaneously, and image quality is good; The zoom lens that visible employing the present embodiment one provides can obtain the image of close shot, object scene and distant view clearly simultaneously, and the zoom lens that namely the present embodiment one provides has the larger depth of field.
It is worth mentioning that, above-mentioned zoom lens has following optical technology index:
Optics overall length TTL≤46mm;
The system focal distance f of zoom lens is 7-22mm;
The system image planes of zoom lens: 1/2.7 〞;
Aperture Range F is 1.6-2.8.
Carry out detailed Optical system below by zoom lens, introduce the zoom lens that the present embodiment one provides further.
As shown in Fig. 5 (a), be zoom lens curvature of field figure of (focusing from) when wide-angle side; Wherein, article three, curve T represents the aberration of the meridional beam (TangentialRays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding respectively, article three, curve S represents the aberration of the sagittal beam (SagittialRays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding respectively, tangent curvature of field value controls within the scope of 0 ~ 0.05mm, and Sagittal field curvature value controls within the scope of 0 ~ 0.05mm.
As shown in Fig. 5 (b), be the distortion figure of zoom lens when wide-angle side, aberration rate controls in-9% ~ 0 scope.
As shown in Figure 6, be the chromaticity difference diagram of zoom lens when wide-angle side.In figure, curve represents elementary color aberration characteristics curve, visible, and elementary Difference Control is between-0.05 ~+0.05.
From above-mentioned Fig. 5 (a), 5 (b) and Fig. 6, the zoom lens that the present embodiment provides, its spherical aberration produced, coma, astigmatism and aberration can be controlled in less scope.
Be more than the explanation carried out in conjunction with this zoom lens each accompanying drawing when wide-angle side, the zoom lens provided for further illustrating the embodiment of the present invention can improve the depth of field, is described below in conjunction with this zoom lens each accompanying drawing at telescope end.
As shown in Figure 7, Figure 8 and Figure 9, wherein, Fig. 7 is that zoom lens is at the curve map of telescope end focusing from optical transfer function during 20m, Fig. 8 is the curve map of the optical transfer function of zoom lens when telescope end minimum photographic distance 6m, and Fig. 9 is the curve map of the optical transfer function of zoom lens when telescope end dolly-out,s dolly-back distance infinite distance.Known from this three width figure, zoom lens is when telescope end is taken close shot (object distance is 6m), object scene (object distance is 20m) and distant view (object distance is infinite distance), the curve map of the MTF that three kinds of scenes are corresponding is basically identical, and, in three kinds of scenes, MTF curve is all smoother and concentrated, that is, this zoom lens also can be taken object scene, close shot and distant view at telescope end simultaneously, and image quality is good.
Carry out detailed Optical system below by zoom lens, introduce the zoom lens that the present embodiment one provides further.
As shown in Figure 10 (a), be zoom lens curvature of field figure of (focusing from) when telescope end; Wherein, article three, curve T represents the aberration of the meridional beam (TangentialRays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding respectively, article three, curve S represents the aberration of the sagittal beam (SagittialRays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding respectively, tangent curvature of field value controls within the scope of 0 ~ 0.1mm, and Sagittal field curvature value controls within the scope of 0 ~ 0.1mm.
As shown in Figure 10 (b), be the distortion figure of zoom lens when telescope end, aberration rate controls in-1% ~ 0 scope.
As shown in figure 11, be the chromaticity difference diagram of zoom lens when telescope end.In figure, curve represents elementary color aberration characteristics curve, visible, and elementary Difference Control is between-0.05 ~+0.05.
From above-mentioned Figure 10 (a), 10 (b) and Figure 11, the zoom lens that the present embodiment provides is at telescope end, and its spherical aberration produced, coma, astigmatism and aberration can be controlled in less scope.
Therefore, the zoom lens that the embodiment of the present invention one provides, adopt the lens of nine ad hoc structure shapes, and be arranged in order to image side according to from thing side, and by the distribution of the focal power of each optical lens, make the planform of zoom lens, the parameters such as abbe number are mated with image-forming condition, can effectively reduce monochromatic aberration, aberration, thus the image of object scene, close shot and distant view clearly can be obtained, and then reach the object expanding the zoom lens depth of field.Moreover Zoom lens structure provided by the invention is simple, compact, the outward appearance overall length of zoom lens can be reduced, and then usage space and parking space can be reduced.
Embodiment two
The optical property of zoom lens provided by the invention is described in detail in embodiment one, the zoom lens with above-mentioned optical property can be Non-follow control, only, when Non-follow control, after realizing zoom, need the regulating time grown just can realize focusing on very much, the picture before causing focusing on after zoom shown by camera lens is all unsharp.Therefore, the present embodiment two provides a kind of zoom lens of automatic control.
As shown in figure 12, the zoom lens that the embodiment of the present invention two provides, comprises above-mentioned zoom group and focus groups, also comprises:
Motor driver 21, zoom gear group 22 and linkage 23, wherein, zoom group and focus groups are arranged in described linkage 23,
Motor driver 21 is connected with zoom gear group 22, drives zoom gear group 22 to rotate;
Described zoom gear group 22 drags described linkage 23 and moves when rotating, the motion of described linkage 23 drives the described zoom group of described linkage 23 inside and described focus groups synchronizing moving.
Herein; because each zoom lens all exists an extenal fixation cylinder in order to protection and all elements of fixing internal; therefore this zoom group and this focus groups are also subject to the straight-line groove restriction inside extenal fixation cylinder simultaneously; do rectilinear motion so the two can only prolong optical axis and can not rotate; this implementation adopts prior art, does not repeat them here.
Preferably, motor driver 21 comprises a motor, and motor is direct current generator or stepper motor.When needs zoom, motor driver 21 rotates according to the drive singal received, and drive zoom gear group 22 to rotate, zoom gear group 22 drags linkage 23 and moves, herein, this linkage can be a rotary cylinder, and the gear driven rotary cylinder of zoom gear group 22 rotates, zoom group and focus groups are all be assemblied in rotary cylinder inside, and then drive zoom group and the focus groups synchronizing moving of rotary cylinder inside.
Zoom group and focus groups have unique corresponding position in moving process, and namely for the optional position at zoom group place, focus groups has the position uniquely corresponding with it, thus in the process realizing zoom and focusing synchronous, can ensure focus.
Thus the zoom lens that the embodiment of the present invention two provides can make zoom group and focus groups move, and makes zoom and focusing synchronous, can realize zooming procedure whole process clear simultaneously.
Further, the drive singal that motor driver 21 receives is determined according to the analog computation of the position relationship to zoom group and focus groups in advance, and the position relationship of zoom group and focus groups is embodied in the cam curve figure of zoom group and focus groups.As shown in figure 13, the cam curve figure of zoom group and focus groups in the zoom lens of the automatic control provided for the embodiment of the present invention two, wherein, preferably, the zoom group that zoom group and focus groups adopt embodiment one to determine and focus groups.As shown in Figure 13, zoom group and focus groups have unique corresponding position in moving process, and such as, in wide-angle side, when namely corner is 0 degree, zoom group is positioned at-9.96mm, and focus groups is positioned at 7.6mm; At telescope end, when namely corner is 75.5 degree, zoom group is positioned at-1.75mm focus groups and is positioned at 0.05mm, is moving in the process of zoom from wide-angle side to telescope end, any position as corner be 31 degree time, zoom group is positioned at-3.08mm focus groups and is positioned at 4.5mm.It should be noted that, the position related in this section all calculates relative to reference datum, is negative on the left of reference field, is just on the right side of reference field; And the position of reference field is on the left of image planes, the position of distance image planes 30.47mm.Thus, in advance according to the cam curve of the zoom group that obtains and focus groups, the drive singal of design motor driver, when this zoom lens real work, when forwarding a certain corner to, motor driver 21 rotates according to the drive singal received, and drive zoom gear group 22 to rotate, zoom gear group 22 drags linkage 23 and moves, and control described zoom group and the focus groups synchronizing moving of linkage 23 inside, namely position respective in zoom group and the cam curve shown in focus groups synchronizing moving to Figure 13 is controlled, thus can to realize picture in the process of zoom be all clearly.
In addition, present invention also offers a kind of image capture device, this image capture device comprises embodiment one or the zoom lens described in embodiment two.The image capture device that the embodiment of the present invention provides can be such as digital camera or data video camera, in this no limit.
In sum, embodiments provide a kind of zoom lens and image capture device, in order to improve the depth of field of zoom lens.Zoom lens provided by the invention has zoom group and focus groups two lens group structures, and each lens position in zoom group is relatively fixing, each lens position in focus groups is relatively fixing, by the distribution of the focal power of each optical lens, make the planform of zoom lens, the parameters such as abbe number are mated with image-forming condition, and effectively can reduce aberration, thus the image of object scene, close shot and distant view clearly can be obtained, and then reach the object expanding the zoom lens depth of field.In addition, Zoom lens structure provided by the invention is simple, compact, can reduce the outward appearance overall length of zoom lens, and then can reduce usage space and parking space.And the embodiment of the present invention additionally provides a kind of zoom lens of automatic control, is connected with zoom gear group by motor driver, zoom gear group is driven to rotate; Described zoom gear group drags the motion of described linkage when rotating, the motion of described linkage drives the described zoom group of described linkage inside and described focus groups synchronizing moving.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a zoom lens, is characterized in that, described camera lens comprises the zoom group and focus groups that set gradually from the object side to image side, wherein,
Described zoom group comprises that the focal power set gradually from the object side to image side is negative the first plano-concave lens, focal power be the first negative biconcave lens and focal power is the first positive biconvex lens, and wherein, the plane of described first plano-concave lens is towards thing side;
Described focus groups comprises that the focal power set gradually from the object side to image side is positive the second biconvex lens, focal power is negative the first meniscus lens, focal power is positive the 3rd biconvex lens, focal power is negative the second biconcave lens, focal power be the 4th positive biconvex lens and focal power is the second negative meniscus lens, wherein, the concave surface of described first meniscus lens and the concave surface of described second meniscus lens are all towards thing side.
2. zoom lens according to claim 1, is characterized in that, described first biconcave lens and described first biconvex lens glue together, and described second biconvex lens and described first meniscus lens glue together, and described 3rd biconvex lens and the second biconcave lens glue together.
3. zoom lens according to claim 2, is characterized in that, described focus groups also comprises: be arranged at described second biconvex lens towards the aperture diaphragm on the surface of thing side.
4. zoom lens according to claim 3, is characterized in that, described focus groups also comprises:
Be arranged at the first packing ring between the first meniscus lens and the 3rd biconvex lens, described first packing ring is for fixing the relative position between the first meniscus lens and the 3rd biconvex lens;
Be arranged at the second packing ring between the second biconcave lens and the 4th biconvex lens, described second packing ring is for fixing the relative position between the second biconcave lens and the 4th biconvex lens.
5. the zoom lens according to the arbitrary claim of claim 1-4, is characterized in that, the Abbe number of described second biconcave lens is greater than 55, and refractive index is greater than 1.58; The Abbe number of the 4th biconvex lens is greater than 60, and refractive index is greater than 1.6.
6. zoom lens according to claim 5, is characterized in that,
Meet between focal distance f ' 2 of the focal distance f of zoom group ' 1 and focus groups: f ' 1>f ' 2;
Zoom lens is in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets between W:
2.5<f’T/f’W<3.2；
The focal distance f of zoom group ' 1 and zoom lens are in the focal distance f of wide-angle side ' meet between W:
2.15<f’1/f’W<2.35；
The displacement dd1 of zoom group when zoom lens is from wide-angle side to telescope end zoom, zoom lens are in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets W:
0.5<dd1/(f’T-f’W)<0.7；
The refractive index of the first meniscus lens is greater than 1.8;
When zoom lens is positioned at wide-angle side from the first plano-concave lens towards the summit of thing side to image planes in the distance LW of optical axis direction and the zoom lens focal distance f in wide-angle side ' meet W:
5.5<LW/f’W<5.8；
Rear cut-off distance fbw when zoom lens is positioned at wide-angle side and zoom lens are in the focal distance f of wide-angle side ' meet between W:
0.8<fbw/f’W<1.1。
7. zoom lens according to claim 6, is characterized in that, in described zoom group, the span at the center of described first plano-concave lens and the interval in the direction of the optical axis, center of described first biconcave lens is [1mm, 1.5mm];
In described focus groups, the span at the center of described first meniscus lens and the interval in the direction of the optical axis, center of described 3rd biconvex lens is [0.1mm, 0.3mm]; The span at the center of described second biconcave lens and the interval in the direction of the optical axis, center of the 4th biconvex lens is [1.05mm, 2.05mm]; The span at the center of described 4th biconvex lens and the interval in the direction of the optical axis, center of described second meniscus lens is [0.1mm, 0.64mm].
8. zoom lens according to claim 6, is characterized in that, in described zoom group, the center of described first plano-concave lens and the center of described first biconcave lens in the direction of the optical axis be spaced apart 1.25mm;
In described focus groups, the center of described first meniscus lens and the center of described 3rd biconvex lens in the direction of the optical axis be spaced apart 0.1mm, the center of described second biconcave lens and the center of the 4th biconvex lens in the direction of the optical axis be spaced apart 1.55mm, the center of described 4th biconvex lens and the center of described second meniscus lens in the direction of the optical axis be spaced apart 0.34mm.
9. zoom lens according to claim 8, is characterized in that, described zoom lens also comprises motor driver, zoom gear group and linkage, and wherein, described zoom group and described focus groups are arranged in described linkage,
Described motor driver is connected with described zoom gear group, drives described zoom gear group to rotate;
Described zoom gear group drags the motion of described linkage when rotating, the motion of described linkage drives the described zoom group of described linkage inside and described focus groups synchronizing moving.
10. an image capture device, is characterized in that, comprises the zoom lens as described in claim as arbitrary in claim 1-10.
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| CN105334605B CN105334605B (en) | 2018-02-16 |
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| CN107272142A (en) * | 2016-04-06 | 2017-10-20 | 三星电机株式会社 | Optical imaging system |
| CN108873275A (en) * | 2018-06-11 | 2018-11-23 | 青岛奥美克医疗科技有限公司 | Zoom adapter optical system, zoom adapter and endoscopic system |
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| CN201107455Y (en) * | 2007-11-19 | 2008-08-27 | 叶明华 | Zoom lens form 6.0mm to 60.0mm |
| CN101666906A (en) * | 2008-09-05 | 2010-03-10 | 索尼株式会社 | Zoom lens and image pickup device |
| CN201335905Y (en) * | 2009-01-07 | 2009-10-28 | 泉州市东南光电有限公司 | Manually adjustable zoom lens |
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| CN105334605B (en) | 2018-02-16 |
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